st: xtivreg2

It seems xtivreg2 does not support bw(auto) for automatic bandwidth. I
am using Stata 11 MP under Linux. I used it on a Windows machine, with
Stata 11, SE. It works with bw(auto). It's possible the Windows
machines has an older version of xtivreg2 on it. Is there a reason for
xtivreg2 to stop supporting that?